on 10 January 2008
The fourth book in this series is based on a sinister government experiment to turn ordinary people into Violets through gene therapy using a serum concocted by the late Dr. Bartholomew Wax. Wax is an eccentric scientist who has amassed the world's greatest collection of stolen art as payment for his covert work. Before committing suicide Wax returns all the stolen art work and exterminates all his test subjects leaving his work incomplete. Wax's former employers plan to use a Violet to channel Wax and get him to complete his experiments.
Natalie Lindstrom heroine in all four books is back using her long-neglected artistic talents to support her family by creating new artworks in collaboration with well-known deceased artists.
One of the victims of the violet "therapy" is Calvin Criswell, an ex art-forger to whom Natalie Lindstrom is attracted. Together they discover the violet serial killer from book 1 has had help escaping and is again on the hunt aiding a consortium of corps members who are trying to create violets.